SCIONS. 73 



At the same time the cellular substance of 

 the scion and its stock adheres so as to form a 

 complete organic union. 



The woody matter descending from the buds 

 passes through the cellular substance into the 

 stock, where it occupies the same situation as 

 would have been occupied by woody matter 

 supplied by buds belonging to the stock itself. 



Once united, the scion covers the wood of 

 the stock with new wood, and causes the pro- 

 duction of new roots. 



But the character of the woody matter sent 

 down by the scion over the wood of the stock 

 being determined by the cellular tissue, which 

 has exclusively a horizontal development, it 

 follows that the wood of the stock will always 

 remain apparently the same, although it is fur- 

 nished by the scion. 



While the preparations of the juices being 

 effected by the leaves of the scion, the produce 

 thereof will be the same as the species from 

 which the scion was taken. 



Some scions will grow upon a stock without 

 being able to transmit any woody matter into 

 it ; as some Cacti, which have only a small 

 central development of woody tissue. 



When this happens, the adhesion of the two 

 7 



